Hot water boiler



Jan. 26, 1932. T. w. DAHLQUIST HOT WATER BOILER Filed 001'.. lO. 1929@wea/@@0370 @amy/fw 1 Patented dan.` 26, 1932 l f i onl'rsofsraes ATENTorties HTH'EODQRE w. `nAnterrestri oF `interrati,` Massecirusnr'rs`I-IO'I i WATER BOILER 'AAppli'cati'onfled October 10, 1929.` Serial No.398,742.

Thisinvention relatest'o allot water boiler LUI of that type employing agas `or like fuel burner located belowthe bottom of the boiler.

` The-invention has for its object to increase .theefficiency of hotwaterboilers of the type referred to, wherebythe water therein may bemore-economically and" quickly heated. i

' 'lothisenid5r the boiler is provided with an .exten'sionwhich projectsbeyond the bottom of the boiler, and said extension has co-op- `"eratingwithlit a tubular body which is of smaller diameter than said extensionand` co-operates therewithandrwith the bottom of the boiler to form` aheating chamber, which is provided with arelatively large gas inletformed by said tubular body7 and is provided with a smaller gasoutletwhich is formed by the tubular body and said extension, saidsmaller gas out-let being located below the bottom of the boiler tocause the flow of gases to be reversed as they pass through the heatingchamber and also to throttle the flow of the gasses out of the heatingchamber and thereby cause the gases in the heating chamber to bemaintained in contact with the bot-V tom of the-lboilerfor asubstantiallength of time and thus more edectively and economically heatthe water in the boiler.

The tubular body also forms a. combustion chamber within which islocated a burner for gas, oil, or like fuel.` D

The tubular body may and preferably will be attachedto ,theboilereXtension and separated therefrom by spacing devices. i

The particular features of the invention will be pointed out in theclaims at the end of this specification.

`Fig.`2, a section on the line2-2, Fig. 1.

Referring to the drawings 10 represents a hot water boiler such asnowcoimnonly used in Akitchens of households and like places. Thebo-iler 1() is provided with the` usual cylindrical shell or bodyportion 12 having Y at its upper end al head (not shown) and 'at itslower end a bottom 13. The bottom 13 is located within the lower end ofthe boiler shell 12 to provide the latter with a portion Fig. 1represents one form of hot 'waterfCombustlorl t boiler embodying thisinvention,V andV 1t which extends below thebotitom 13 and l forms askirt for the boiler. Y

In accordance with the present invention,

the `skirt.` or extension 14 of the boiler shell has co-operating withit atubular body 15, preferably of metal and cylindrical in shape and ofsmaller diameter than the skirt 14, which forms with the said skirt anannular passage 41G (see Fig. 2), which connectsthe space or chamber 17with the atmosphere.

The chamber 17 forms a heating chamber v which is closed at its top andsides by the bottom 13 and skirt 14 of theboiler and is in opencommunication at its lower end with the tubular body and with theatmosphere.

Y The tubular body 15 forms a combustion chamber 20 in which is locateda burner 21 for gas, oil, or like fuel, and said burner is provided witha fuelinlet pipe`22 which is'` connected with a suitable source ofsupply not shown. y Y

The tubular body 15 may be secured to the skirt 14 of the body by rivets23 or other fas- Y toning devices and separated by spacing bushings 24;through.which-therivets 23 are passed in the construction herein shown.

The combustion chamber 2O may be closed i with suitable air inlets forsupporting combustion, and the bottom plate 25 may beproidcd with holes32 for this purpose.

`The boiler herein shown in provided with a cold water inlet pipe 33fandwith a hot water outlet pipe 34 and also with a thermo- .staticdevice 35 for automatically controlling the supply of gas or other fuelto the burner. The gas inlet pipe 22 is provided with a manuallyoperated valve 36 and withVV an Aautomatic valve which is conventionallyrepresented at 37 and which is controlled by the thermostatic device 35,which is also conventionally represented. These parts are well known andare in common use in hot Y water boilers and form no part of the presentinvention.

tion pass through the outlet In operation the products of combustionfrom the burner 21 flow upwardly fromthe combustion chamber 2O .into theheating chamber 17 wherein they contact with the bottom 13 of the boilerand their flow :isthen A reversed and they flow downward and passthrough the outlet passage 16 .to-.the outside .of the boiler and thenthrough the passage 30 to the atmosphere when the boiler is providedwith the insulating Vjacket herein shown.' y

When the boiler is not provided with the insulating jacket, the productsof combuspassage 16 directly into the atmosphere. Astheflow of theproducts of combustion are reversed in the'heating chamber and caused toflow downward therein to the outletv passageV V16 therefor, .the saidkproducts of combustion are ,throttled or retarded in their passage,out-v of the heating chamber,` inasmuch as the area of the outletpassage 16 is materially less than ,the area of the inlet for theheat-ing chamber, which inlet is formed by the tubular body 15.

vAs a result of this construction and arrangement, the products ofcombustion are yretained in contact with the bottom of the boiler or agreater length of time than would be the case if their iow was notreversed and throttled, and consequently a greater quantity of heat istransferred to the water in the boiler andi-the water therein is morequickly `and economically heated.

` It may be preferredto securedthetubular body 15'to the skirt orextension 14; of the boiler shell asfherein represented, but it is notdesired to limit the invention in this respect, as'the tubular body maybe 'Welded or otherwise attached at its lower endto the plate .and haveits upper end disconnected from the skirt 14 ofthe boiler.

v having its upper end projecting into the saidy skirt and securedtheretoran'd separated therefrom to forman outlet passage Jora heating.chamber'formed by said boiler bottom,V eX- tension and tubular sheetmetal member, said outlet passage beinglocated suiciently near thebottom of the boiler to cause said tubular sheet metal member to directthe combustion gases against the bottom of the boiler prior to theirescape through said outlet passage.

2. The combination With a hot water boiler having a body Aportionprovided With a bottomand with avskirt lprojectingbelow said bottom, ofa tubular body co-operating with saidskirtand Withithe bottom of theboiler to form a heating chamberhaving a substantially large gas inletformed by the tubular body and a smaller gas outlet formed by thetubular bQtlyandfsaidlskirt, said tubular body having its upper' endarranged with relation to said skirttoobstructthe free .flow of gasesfrom the combustion chamber .to the outsideof -the boiler andcausesaidgasesto flow upwardly .beyondsaid outlet .into said heating chamber andthen downward .therelfrom through the vsmaller gas outlet ltothe outsideof the boiler, whereby ,-tliezbottom ot the-boiler issubjected=to1theaction of amaximum-quantityof hot gases movingthroughtheheating chamber in contact With the bottom oftheboiler before passingthrough said gas outlet.

.In testimony whereof, .1I lhave Vsigned my lname to .thisspecifica-tion.

THEODORE W. DAHLQUIST.

